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.Dd September 9, 2015
.Dt BIOS 9
.Os
.Sh NAME
.Nm bios_sigsearch ,
.Nm BIOS_PADDRTOVADDR ,
.Nm BIOS_VADDRTOPADDR
.Nd interact with PC BIOS
.Sh SYNOPSIS
.In sys/types.h
.In machine/pc/bios.h
.Ft u_int32_t
.Fn bios_sigsearch "u_int32_t start" "u_char *sig" "int siglen" "int paralen" "int sigofs"
.Fn BIOS_PADDRTOVADDR "addr"
.Fn BIOS_VADDRTOPADDR "addr"
.Sh DESCRIPTION
A number of macros and functions are available to deal with BIOS data
encountered on x86 PC-architecture systems.
.Bl -tag -width ".Fn BIOS_PADDRTOVADDR"
.It Fn bios_sigsearch
Searches the BIOS address space for a service signature, usually an
uppercase ASCII sequence surrounded by underscores.  The search begins
at
.Fa start ,
or at the beginning of the BIOS if
.Fa start
is zero.
.Fa siglen
bytes of the BIOS image and
.Fa sig
are compared at
.Fa sigofs
bytes offset from the current location.  If no match is found, the
current location is incremented by
.Fa paralen
bytes and the search repeated.  If the signature is found, its effective
physical address is returned.  If no signature is found, zero is returned.
.It Fn BIOS_VADDRTOPADDR
Returns the effective physical address which corresponds to the kernel
virtual address
.Fa addr .
.It Fn BIOS_PADDRTOVADDR
Returns the kernel virtual address which corresponds to the effective
physical address
.Fa addr .
.El